Average Weather in December in Ojai California, United States
Daily high temperatures decrease by 3°F, from 65°F to 63°F, rarely falling below 54°F or exceeding 74°F. The lowest daily average high temperature is 62°F on December 25.
Daily low temperatures are around 42°F, rarely falling below 33°F or exceeding 51°F. The lowest daily average low temperature is 41°F on December 25.
For reference, on August 2, the hottest day of the year, temperatures in Ojai typically range from 61°F to 84°F, while on December 25, the coldest day of the year, they range from 41°F to 62°F.
Average High and Low Temperature in December
The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on December. The horizontal axis is the day, the vertical axis is the hour of the day, and the color is the average temperature for that hour and day.
Average Hourly Temperature in December
The month of December in Ojai experiences gradually increasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy increasing from 39% to 45%. The highest chance of overcast or mostly cloudy conditions is 45% on December 29.
The clearest day of the month is December 1, with clear, mostly clear, or partly cloudy conditions 61% of the time.
For reference, on February 20, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 47%, while on August 9, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 90%.
Cloud Cover Categories in December
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Ojai, the chance of a wet day over the course of December is increasing, starting the month at 12% and ending it at 17%.
For reference, the year's highest daily chance of a wet day is 22% on February 20, and its lowest chance is 0% on June 24.
Probability of Precipitation in December
The average sliding 31-day rainfall during December in Ojai is rapidly increasing, starting the month at 1.5 inches, when it rarely exceeds 3.4 inches or falls below 0.1 inches, and ending the month at 2.7 inches, when it rarely exceeds 6.6 inches or falls below 0.1 inches.
Average Monthly Rainfall in December
Over the course of December in Ojai, the length of the day is essentially constant. The shortest day of the month is December 21, with 9 hours, 51 minutes of daylight and the longest day is December 1, with 10 hours, 1 minute of daylight.
Hours of Daylight and Twilight in December
The earliest sunrise of the month in Ojai is 6:45 AM on December 1 and the latest sunrise is 18 minutes later at 7:03 AM on December 31.
The earliest sunset is 4:46 PM on December 5 and the latest sunset is 10 minutes later at 4:56 PM on December 31.
Daylight saving time is observed in Ojai during 2018, but it neither starts nor ends during December, so the entire month is in standard time.
For reference, on June 21, the longest day of the year, the Sun rises at 5:44 AM and sets 14 hours, 28 minutes later, at 8:12 PM, while on December 21, the shortest day of the year, it rises at 6:59 AM and sets 9 hours, 51 minutes later, at 4:50 PM.
Sunrise & Sunset with Twilight and Daylight Saving Time in December
The chance that a given day will be muggy in Ojai is essentially constant during December, remaining around 0% throughout.
For reference, on September 11, the muggiest day of the year, there are muggy conditions 0% of the time, while on January 1, the least muggy day of the year, there are muggy conditions 0% of the time.
Humidity Comfort Levels in December
The average hourly wind speed in Ojai is essentially constant during December, remaining within 0.1 miles per hour of 7.0 miles per hour throughout.
For reference, on December 10, the windiest day of the year, the daily average wind speed is 7.1 miles per hour, while on August 6, the calmest day of the year, the daily average wind speed is 4.6 miles per hour.
The highest daily average wind speed during December is 7.1 miles per hour on December 11.
Average Wind Speed in December
Wind Direction in December
Ojai is located near a large body of water (e.g., ocean, sea, or large lake). This section reports on the wide-area average surface temperature of that water.
The average surface water temperature in Ojai is gradually decreasing during December, falling by 2°F, from 60°F to 58°F, over the course of the month.
Average Water Temperature in December
The growing season in Ojai typically lasts for 11 months (334 days), from around January 27 to around December 27, rarely starting after March 16, or ending before November 30.
During December in Ojai, the chance that a given day is within the growing season is rapidly decreasing falling from 88% to 47% over the course of the month.
Time Spent in Various Temperature Bands and the Growing Season in December
The average accumulated growing degree days in Ojai are gradually increasing during December, increasing by 126°F, from 4,079°F to 4,205°F, over the course of the month.
Growing Degree Days in December
The average daily incident shortwave solar energy in Ojai is essentially constant during December, remaining within 0.2 kWh of 3.0 kWh throughout.
The lowest average daily incident shortwave solar energy during December is 2.9 kWh on December 26.
Average Daily Incident Shortwave Solar Energy in December
For the purposes of this report, the geographical coordinates of Ojai are 34.448 deg latitude, -119.243 deg longitude, and 984 ft elevation.
The topography within 2 miles of Ojai contains very significant variations in elevation, with a maximum elevation change of 1,450 feet and an average elevation above sea level of 936 feet. Within 10 miles contains very significant variations in elevation (6,316 feet). Within 50 miles also contains extreme variations in elevation (8,819 feet).
The area within 2 miles of Ojai is covered by shrubs (56%), cropland (19%), artificial surfaces (14%), and grassland (11%), within 10 miles by shrubs (70%) and grassland (14%), and within 50 miles by shrubs (39%) and water (30%).
This report illustrates the typical weather in Ojai year round, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016.
Temperature and Dew Point
There are 4 weather stations near enough to contribute to our estimation of the temperature and dew point in Ojai.
For each station, the records are corrected for the elevation difference between that station and Ojai according to the International Standard Atmosphere , and by the relative change present in the MERRA-2 satellite-era reanalysis between the two locations.
The estimated value at Ojai is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Ojai and a given station.
The stations contributing to this reconstruction are: Oxnard Airport (37%, 28 kilometers, south); Camarillo Airport (37%, 30 kilometers, southeast); Santa Barbara Municipal Airport (19%, 55 kilometers, west); and Sandberg (7%, 58 kilometers, northeast).
Time zones for aiports and weather stations are provided by AskGeo.com .